A lesser-known setting in Android lets you end calls by hitting your phone's power button instead of the End button on your screen.

Sometimes, as you're coming out of a call, your screen takes a few seconds to turn back on, which can be really annoying. If you head into Settings > Accessibility, hit Cancel if you get a pop window, and check the "Power Button Ends Call" setting, you can end it with the physical power button on your phone. This can be a little faster and more convenient, especially if your phone's proximity sensor refuses to cooperate.